Sleep Sack Safety

The American Academy of Pediatrics recommends a wearable blanket or sleep sack over loose bedding to keep your baby warm during sleep. Here’s how to get the fit right and what to watch for.

The AAP prefers sleep sacks and other wearable blankets over loose blankets and coverings. Fit matters most — the sack should fit snugly at the neck and arm openings so it can’t ride up over your baby’s face. Skip weighted sleep sacks, and check the label for your baby’s current weight and height.

Why Sleep Sacks Are Considered Safer Than Loose Blankets

According to the American Academy of Pediatrics, infant sleep clothing — layers of clothing or a wearable blanket or sleep sack — is preferred over blankets and other loose coverings to keep a baby warm. A sleep sack is a sleeveless garment worn over pajamas, designed specifically to stay in place without covering your baby’s face, which is why it avoids the entrapment and suffocation risks associated with loose blankets in the crib.

Getting the Fit Right

Check the neck and arm openings: they should be snug enough that the sack can’t ride up and cover your baby’s face, but not so tight that they restrict movement or breathing. Choose the size recommended for your baby’s current weight and height on the product label rather than sizing up for extra room, since a too-large sack is more likely to shift out of place.

A properly fitted sleep sack still allows your baby to move their legs and, once they’re able to, roll over — and to roll back if they land on their stomach.

Avoid Weighted Sleep Sacks

Weighted sleep sacks, weighted swaddles, and other weighted sleep products are not recommended. Infant safety guidance warns that added weight can place too much pressure on a baby’s chest and lungs, and these products are not endorsed by the AAP.

Sleep Sacks vs. Swaddling

A sleep sack and a swaddle are different products with different purposes: a swaddle wraps a baby’s arms snugly against their body, while a sleep sack leaves the arms free and simply replaces a loose blanket. Once a baby shows signs of rolling, swaddling with the arms restricted is no longer recommended — see our Baby Swaddling Safety guide for the specifics of transitioning away from swaddling.

When to Stop Using a Sleep Sack

There’s no single AAP-mandated age to stop using a properly fitted sleep sack — the AAP guidance indicates it can be used for as long as it continues to fit correctly and your baby can move freely in it. Re-check the fit as your baby grows, and size up when the current one becomes snug.

Sources

This guide is based on published guidance from the American Academy of Pediatrics’ safe sleep recommendations, as reported via HealthyChildren.org and independently summarized reporting on AAP guidance regarding wearable blankets and weighted sleep products.

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